A vehicle arrives at the abandoned Chilocco Indian School campus in Newkirk, Okla., Wednesday, Nov. 29, 2017. The federal government plans to release what it calls inert chemicals into the atmosphere here and in nearby Arkansas City, Kan., to gauge how authorities might respond to a bioterror event. (AP Photo/Sue Ogrocki)

Brian Hobbs, one of the community leaders in opposition to using the abandoned Chilocco Indian School campus for bioterror testing, stands during an interview outside the campus in Newkirk, Okla., Wednesday, Nov. 29, 2017. (AP Photo/Sue Ogrocki)

Buildings at the abandoned Chilocco Indian School campus are pictured in Newkirk, Okla., Wednesday, Nov. 29, 2017. The federal government plans to release what it calls inert chemicals into the atmosphere here and in nearby Arkansas City, Kan., to gauge how authorities might respond to a bioterror event. (AP Photo/Sue Ogrocki)